.article_sidebar 
    overflow auto
    // max-height 20rem
    // max-height calc(100vh - 487px)
    max-height calc(100vh - 31rem)
    ul
        padding 0
        margin 0
        li
            line-height 1.7
            padding-bottom 2px
        .active
            font-weight 600
        .level2
            font-size 0.9rem
            padding-left 10px
        .level3
            font-size 0.8rem
            padding-left 20px
        .level4
            font-size 0.7rem
            padding-left 30px
        a
            color var(--font-color)
            text-decoration inherit
            &:hover, &:active
                font-weight 600
                // text-decoration-line underline
